terminate the existing emersion circuit on a fused spur with a 3A fuse and run on from there to the shaver position.
Assumption is made that the circuit is via an RCD at the main fuse board.
Why quote without comment? The whole idea of quoting is to show who's reply you are answering and also what part of that reply.
I look at the quote and ask why is it quoted? Do you think it's right, or wrong or are you questioning spelling? Or way phrased?
Saying it will need RCD protection is another way of putting it. OK should be immersion but does it matter I would think not.
So come on why have you quoted?????